enum {
  TK_L_ROUND_BRACK,		// (
  TK_R_ROUND_BRACK,		// )
  TK_L_CLOSURE_BRACK,		// {
  TK_R_CLOSURE_BRACK,		// }
  TK_ADD,			// +
  TK_SUB,			// - 
  TK_MUL,			// *
  TK_RIGHT_ARROW,		// ->
  TK_TUPLE_APPEND,		// ,
  TK_EQUAL,			// =
  TK_ASSIGN,			// :=
  TK_NEWLINE,
  TK_NUMBER,
  TK_ANONYMOUS_VAR,		// _
  TK_SYMBOL,
  TK_VAR,
  TK_AND,
  TK_ELSE,
  TK_IF,
  TK_IN,
  TK_NOT,
  TK_OR,
  TK_THEN,
};
